What is on this bluethroat trigger face?

DerekC

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He was fine this morning. Then suddenly this shows up:

20171220_131520.jpg


Stung by the Brittle starfish? I knew they were fighting for the piece of silverside I dropped in this morning.
Thanks.
 
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REEFTIDE

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Could a coral have done this?

Not unlikely ... we often see similar marks (though darker, on a light background, called "hypermelanization") pretty commonly on clownfish that attempt to guest in, for example, frogspawns or hammers.

~Bruce
 
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DerekC

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Ok. I wrote to Bob Fenner (wetwebmedia.com and author of Triggerfishes for Marine Aquariums) and he thought it was "burn" by bristleworms. I have a lot of those and this blue throat is new to the tank (2 - 3 days). I guess it has learned a lesson. This morning the burn seems to fade away.
Thank you guys.
 

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